test/vsock: add big message test

This adds test for sending message, bigger than peer's buffer size.
For SOCK_SEQPACKET socket it must fail, as this type of socket has
message size limit.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 26c38ad9d07b345ff16d7ad7a01f5ac5029353d4..67e9f9df3a8c4eae6421fe23b8bcef89319140ea 100644 (file)
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -569,6 +569,70 @@ static void test_seqpacket_timeout_server(const struct test_opts *opts)
        close(fd);
 }
 
+static void test_seqpacket_bigmsg_client(const struct test_opts *opts)
+{
+       unsigned long sock_buf_size;
+       ssize_t send_size;
+       socklen_t len;
+       void *data;
+       int fd;
+
+       len = sizeof(sock_buf_size);
+
+       fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+       if (fd < 0) {
+               perror("connect");
+               exit(EXIT_FAILURE);
+       }
+
+       if (getsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
+                      &sock_buf_size, &len)) {
+               perror("getsockopt");
+               exit(EXIT_FAILURE);
+       }
+
+       sock_buf_size++;
+
+       data = malloc(sock_buf_size);
+       if (!data) {
+               perror("malloc");
+               exit(EXIT_FAILURE);
+       }
+
+       send_size = send(fd, data, sock_buf_size, 0);
+       if (send_size != -1) {
+               fprintf(stderr, "expected 'send(2)' failure, got %zi\n",
+                       send_size);
+               exit(EXIT_FAILURE);
+       }
+
+       if (errno != EMSGSIZE) {
+               fprintf(stderr, "expected EMSGSIZE in 'errno', got %i\n",
+                       errno);
+               exit(EXIT_FAILURE);
+       }
+
+       control_writeln("CLISENT");
+
+       free(data);
+       close(fd);
+}
+
+static void test_seqpacket_bigmsg_server(const struct test_opts *opts)
+{
+       int fd;
+
+       fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+       if (fd < 0) {
+               perror("accept");
+               exit(EXIT_FAILURE);
+       }
+
+       control_expectln("CLISENT");
+
+       close(fd);
+}
+
 #define BUF_PATTERN_1 'a'
 #define BUF_PATTERN_2 'b'
 
@@ -851,6 +915,11 @@ static struct test_case test_cases[] = {
                .run_client = test_stream_poll_rcvlowat_client,
                .run_server = test_stream_poll_rcvlowat_server,
        },
+       {
+               .name = "SOCK_SEQPACKET big message",
+               .run_client = test_seqpacket_bigmsg_client,
+               .run_server = test_seqpacket_bigmsg_server,
+       },
        {},
 };